MKS Instruments UK Ltd
Cirrus2 Hardware Manual – SP101017.100 June 2011
43
Changing filaments
Changing filaments is the most common maintenance event with quadrupole analysers. For this reason the MKS
analyser has been designed to make this task as quick and easy as possible.
Below is a list of the tools and equipment you will require. We recommend that you assemble the following items before
you start. Remember that the instrument is supplied with a tool kit that contains some of the things you will need;
small jewelers screwdriver (2mm)
pair of tweezers
small pair of smooth jawed needle nosed pliers
pair of clean cotton gloves
clean bench on which to work
Ohmmeter
clean container in which to put small parts
replacement filament
a method of holding the analyser securely in an upright position, (a small bench vice is ideal).
pen and paper on which to make notes and sketches
You are now ready to pump down and continue the operation of your quadrupole.
Removing the filaments
1. Remove the analyser from the vacuum system making sure that you do not touch the exposed internal surfaces and
place it on the bench in an upright position.
2. The filaments are located on the very top of the analyser, retained by four M2 x4 pan head screws. The electrical
connections are made via two barrel connectors, one to each filament, see Fig.1.
3. Hold the barrel connectors highlighted in orange firmly with your pliers and slacken the screws highlighted in red until
the barrel connector can be removed from the filament plate and the connecting lead, see Fig.2.
4.
Remove the four M2 x4 pan head screws highlighted in red holding the filament plate in place, see Fig.3.
5.
Remove the two filament plates. Carry out this step carefully so as not to damage the filaments, see Fig.4.
Refer to the views on the following page